M. Keeditse, Hannah Buamono, Yasushi Watanabe, A. Arribas, T. Echigo, S. Aoki
{"title":"Understanding High-grade Mineralization in the Khoemacau Zone 5 Cu-Ag Deposit, Kalahari Copperbelt, NW Botswana, using μXRF Techniques","authors":"M. Keeditse, Hannah Buamono, Yasushi Watanabe, A. Arribas, T. Echigo, S. Aoki","doi":"10.5188/ijsmer.25.33","DOIUrl":"https://doi.org/10.5188/ijsmer.25.33","url":null,"abstract":"","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87461873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gas Adsorption Capability of Hybrid Polymers with Modifi ed Cyclodextrin-amorphous Silica","authors":"F. Hamada, M. Yamada","doi":"10.5188/ijsmer.25.23","DOIUrl":"https://doi.org/10.5188/ijsmer.25.23","url":null,"abstract":"","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88093081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Young, A. Das, R. Ladouceur, Simon Timbillah, Shawn Childress
{"title":"Review of the Mechanism for Orfom® D8 Depression of Chalcopyrite in Cu-Mo Separation during Cleaner Flotation","authors":"C. Young, A. Das, R. Ladouceur, Simon Timbillah, Shawn Childress","doi":"10.5188/ijsmer.25.18","DOIUrl":"https://doi.org/10.5188/ijsmer.25.18","url":null,"abstract":"","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89560849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Kamiya, Kaito Suzuki, Etsushi Okuyama, N. Kojima, S. Ito, Mamoru Takahashi, Kenji Murata, Takashi Kazumi, Arata Maisawa, M. Nakatsu, H. Mizuma, H. Sodeyama, Y. Iwama, Nobuyasu Furuuchi, Keizo Shinya
{"title":"Controlled Cracking for Industrial Concrete Waste by Steam Pressure Cracking Agent","authors":"O. Kamiya, Kaito Suzuki, Etsushi Okuyama, N. Kojima, S. Ito, Mamoru Takahashi, Kenji Murata, Takashi Kazumi, Arata Maisawa, M. Nakatsu, H. Mizuma, H. Sodeyama, Y. Iwama, Nobuyasu Furuuchi, Keizo Shinya","doi":"10.5188/ijsmer.24.18","DOIUrl":"https://doi.org/10.5188/ijsmer.24.18","url":null,"abstract":"We propose a quick and controlled cracking method for industrial ceramic waste by applying a steam pressure cracking (SPC) agent. The agent is a non-explosive and low-vibration-type chemical, which was developed by one of the authors of this study. We prepared a concrete specimen that had a diameter and cylinder height of 150 mm. Several grams of the agent cracked the specimen. We could control the cracking better in water than air when the air and water conditions were compared. When tested in water, the agent was placed in the hole of the concrete specimen and ignited, and the specimen could be split into two or three pieces of the same size. However, using another SPC agent that was explosive, the concrete specimen was broken into small fragments and size of the concrete pieces could not be controlled. The crushing mechanism was different for the two cases. The explosive crushed the concrete mainly through elastic shock waves. However, the steam pressure cracking agent breaks the specimen using the steam pressure and shock waves. We demonstrated that the cracking can also be controlled using guide holes. This steam pressure method can be applied to industrial waste as a safe and well-controlled method.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86740421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kazuya Matsumoto, S. Ohno, Yukinori Hata, Yuto Sezaki, M. Jikei
{"title":"Rhodium(III) Recovery from HCl Solutions Using 4-Alkylaniline-Impregnated Resins","authors":"Kazuya Matsumoto, S. Ohno, Yukinori Hata, Yuto Sezaki, M. Jikei","doi":"10.5188/ijsmer.24.13","DOIUrl":"https://doi.org/10.5188/ijsmer.24.13","url":null,"abstract":"and Pt(IV) standard solutions were In this study, 4-butylaniline-impregnated resins (BuIRs) were prepared by soaking hydrophobic porous resins in aqueous solutions of 4-butylaniline hydrochloride. Rh(III) was successfully adsorbed by BuIRs from 10 ppm Rh(III) solutions (6 M HCl). The quantitative desorption of Rh(III) accompanied with 4-butylaniline hydrochloride from BuIRs was also achieved by Soxhlet extraction using methanol. UV-Vis absorption measurements of Rh(III)-containing solutions showed that the equilibrium shift of Rh(III)-based species in HCl solutions is slow, and heating of the solutions is effective for equilibrating. The BuIRs obtained in this study effectively recovered the Rh(III) chloro-complex anion ([RhCl 6 ] 3 − ) from low Rh(III) concentration solutions, and can be useful in the Rh(III) recovery process.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81584926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroki Takahashi, Yuuji Ozawa, Keisuke Ohkubo, M. Taguchi, Kazunari Suzuki
{"title":"Oxygen Evolution Overpotential of Pb-based Insoluble Anode Containing Ru Oxide Powders Prepared by Liquid-phase Reaction and Heating","authors":"Hiroki Takahashi, Yuuji Ozawa, Keisuke Ohkubo, M. Taguchi, Kazunari Suzuki","doi":"10.5188/ijsmer.24.6","DOIUrl":"https://doi.org/10.5188/ijsmer.24.6","url":null,"abstract":"limit. Thus, it becomes very important to reduce the anode overpotential η a in order to reduce the bath voltage. In addition, a significant part of the anode overpotential is the oxygen evolution overpotential. Therefore, it can be concluded that an effective way to reduce the electric power required for Zn electrowinning is to reduce the oxygen evolution overpotential on the Pb-based insoluble anode 4) . Our research team has produced a Pb-based anode containing homogeneously distributed oxide powders as the electrode catalyst by adopting a new powder-rolling method 5,6) , which replaces the conventional cast-rolling method 7-9) . Pb- based anodes containing various oxide catalysts have been produced by this powder-rolling method and the anode potential investigated by galvanostatic electrolysis. A remarkable decrease in anode potential was observed in a Pb-based powder rolled anode containing RuO 2 powder as the electrode catalyst (See Figure 1). It was concluded that the alternative Pb-based anode incorporating RuO 2 powder was very effective in decreasing the oxygen evolution overpotential and reducing the electric power required for Zn electrowinning . Ruthenium oxide powders were produced by the reaction of an RuCl 3 solution with H 2 O 2 , followed by heating of the resulting precursor at a temperature between 200°C and 600°C in air. Pb-based anodes containing these heated products of 1.0 mass% were prepared by the powder-rolling method, and the effect of the heated product as an electrode catalyst on lowering the anode potential was investigated in order to develop an energy-saving insoluble anode for Zn electrowinning. Based on XPS results, RuO 2 with a signi fi cant amount of RuO 2 ・ n H 2 O was produced by heating the precursor at 250°C or lower. The ratio of RuO 2 to RuO 2 ・ n H 2 O increased remarkably above 300 ° C and the potential of the Pb-based anode decreased in inverse proportion to the RuO 2 content of the heated product. The lowest anode potential of 1.72 V vs. NHE, which was about 360 mV lower than that of the anode with the unheated precursor, was observed for the Pb-based anode containing the product heated at 400°C. However, the anode potential of the Pb-based anode increased again when the heating temperature was 500°C or higher. The subsequent increase in the anode potential was probably caused by a decrease in the active sites of the oxygen evolution reaction, that is, the grain growth of the heated product decreased the effective reaction area of the RuO 2 catalyst.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78463584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation of Cyclic Oxidation Resistant Coating Consisting of Ni Aluminide and Ni-Hf Alloy Layers on Ni-Cr-Al Alloy by Electrodeposition","authors":"S. Uchida, Naka Sato, M. Fukumoto, M. Hara","doi":"10.5188/ijsmer.24.1","DOIUrl":"https://doi.org/10.5188/ijsmer.24.1","url":null,"abstract":"The preparation of a coating consisting of a Ni aluminide layer and Ni-Hf alloy layer on a Ni-Cr-Al alloy was attempted by the four-step electrodeposition of Ni, Hf, Ni and Al. In this study, the Ni electrodeposition was carried out using an aqueous solution, while the Hf and Al electrodepositions were carried out using a molten salt at 1023 K. The cyclic oxidation resistance for the alloy covered with the coting was then evaluated in air at 1373 K. This estimation was carried out by comparison of the alloy covered with a single Ni aluminide layer. For the alloy covered with the single Ni aluminide layer, a decrease in the mass gain of the alloy due to scale spalling was observed, while for the alloy covered with the bilayer coating, such a decrease was not observed. It was found from the observation of a cross-section of the alloy covered with the single Ni aluminide layer that the Al concentration in the surface region of the Ni aluminide layer decreased due to the diffusion of Al from the Ni aluminide layer to the substrate alloy. On the other hand, for the alloy covered with the bilayer coating, the diffusion of Al from the Ni aluminide layer to the substrate alloy was inhibited by the diffusion barrier effect of the Ni-Hf alloy layer. After the 10-cycle oxidation, the decomposition of the Ni-Hf alloy layer proceeded, and as a result, Hf in the Ni-Hf alloy layer diffused into the surface region of the Ni aluminide layer. The Hf in the surface region of the Ni aluminide layer led to the formation of an adhesive scale having a spiked shape.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80812787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Senthil, Ryoya Hata, Kazuya Matsumoto, M. Jikei
{"title":"Synthesis and Properties of Hyperbranched Aromatic Polyimides via Thermal Self-Polycondensation","authors":"K. Senthil, Ryoya Hata, Kazuya Matsumoto, M. Jikei","doi":"10.5188/ijsmer.24.23","DOIUrl":"https://doi.org/10.5188/ijsmer.24.23","url":null,"abstract":"hyperbranched aromatic polyimides synthesized from AB 2 type monomers the use of condensation agents. The HBPI-AA synthesized heating the AB 2 type monomer at a relatively low temperature chemical imidization the hyperbranched polyimides, characterized by gel permeation chromatography (GPC) a light scattering detector and NMR measurements. The thermal properties, the film foaming ability, the solubility change after heating The thermal self-polycondensation of 4-(3,5-bis(4-aminophenoxy)phenoxy)phthalic acid, an AB 2 type monomer, proceeded successfully at 140°C to form a hyperbranched poly(amic acid). The subsequent chemical imidization of the poly(amic acid) afforded hyperbranched aromatic polyimides bearing acetylamide ( HBPI-Ac ) or imide terminal ( HBPI-Im ) groups. The formation of high molecular weight polymers was confirmed by gel permeation chromatography measurements using a light scattering detector. The resulting polymers exhibited good solubility and low solution viscosity, which is typical for hyperbranched polymers. The degree of branching of HBPI-Ac was determined to be 0.48. Moreover, the 1 H NMR measurement of the model phthalic acid compound at 120 ° C suggested that the formation of carboxyl anhydride units facilitated the amide bond formation, resulting in the hyperbranched poly(amic acid). HBPI-Im showed the temperature for a 5 % weight loss at 470°C, which was much higher than that of HBPI-Ac (400°C). HBPI-Im fi lm, coated on a glass plate, became insoluble in amide solvents after heating at 280 °C for 10 min, indicating that it could be applied as a solvent-resistant and thermally stable coating in the microelectronics industry.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88747311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shota Sato, Hiroshi Yokoyama, Y. Kageyama, C. Ishizawa, M. Nishida, Kazuharu Konishi
{"title":"Development of a 3D Hair Simulator to Support a Hairdresser's Haircut","authors":"Shota Sato, Hiroshi Yokoyama, Y. Kageyama, C. Ishizawa, M. Nishida, Kazuharu Konishi","doi":"10.5188/ijsmer.23.137","DOIUrl":"https://doi.org/10.5188/ijsmer.23.137","url":null,"abstract":"While getting a haircut at a hairdresser’s, a customer may be unable to effectively communicate his or her hair-related needs. Additionally, the hairdresser often does not share an accurate final image of the customer’s hairstyle even with the use of a hair catalog. Head shapes differ for each individual, which implies that the customer’s head shape would be different from that of a catalog model. Often, the customer’s expectations of the desired hairstyle and the practical results are different. If the final image of the customer’s haircut is presented using a 3D hair simulator beforehand, it would facilitate the sharing of hair-related needs between the customer and the hairdresser, thereby improving customer satisfaction. In our previous study, we proposed a basic simulation method that took into consideration the head model generation method and the hairdresser’s cutting technique. However, the study did not adequately consider the operability, such as the adjustment of hair in the simulator. Therefore, in this study, we developed a 3D hair simulator to provide support for hairdressers. In particular, we improved the interface for adjusting hair length and evaluated the operability improvement.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87767784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tomoaki Saito, Hiroaki Fujiwara, Y. Abe, S. Kumagai
{"title":"Hard Carbon/SiOx Composite Active Material Prepared from Phenolic Resin and Rice Husk for Li-ion Battery Negative Electrode","authors":"Tomoaki Saito, Hiroaki Fujiwara, Y. Abe, S. Kumagai","doi":"10.5188/ijsmer.23.142","DOIUrl":"https://doi.org/10.5188/ijsmer.23.142","url":null,"abstract":"The composite negative electrode active material of Li-ion batteries (LIBs) was fabricated using phenolic resin (PR) and agricultural waste of rice husk (RH). Because silicates were intrinsically composed in RH, the composite of hard carbon (HC) and SiO x (HC/SiO x composite) was readily prepared by carbonizing the mixture of PR and RH. Li-ion insertion and extraction capacity of the HC/SiO x composite was evaluated in a half-cell con fi guration using Li metal as the counter electrode, in comparison with those of the carbonized RH and the commercial HC. It was revealed the HC/SiO x composite exhibited 30% higher speci fi c capacity of Li-ion insertion/extraction than did the commercial HC. In addition to this, its capacity retention was found to be approximately equal to that of the commercial HC. The performance comparison of the HC/SiO x composite and the carbonized RH suggested that hybridization of HC and SiO x was useful to alleviate the capacity fading of the SiO x part with maintaining the increased speci fi c capacity attributed to the SiO x part. Cost-effective active material for the LIB negative electrode with acceptable performances could be realized by the simple carbonization of the mixture of PR and RH. The produced HC/SiO x composite was promising for vehicle applications requiring excellent cycle performance and high cost effectiveness.","PeriodicalId":14339,"journal":{"name":"International journal of the Society of Materials Engineering for Resources","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80265250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}